/Engine/Plugins/FX/Niagara/Source/NiagaraEditor/Public/NiagaraEditorModule.h
[TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [FNiagaraSystemViewModel](API\Plugins\NiagaraEditor\ViewModels\FNiagaraSystemViewModel) > GetExistingViewModelForSystem ( [UNiagaraSystem](API\Plugins\Niagara\UNiagaraSystem) * InSystem )